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olga_2 [115]
4 years ago
7

A worker uses a cart to move a load of bricks weighing 680 N a distance of 10 m across a parking lot. If the worker pushes the c

art with a constant force of 209 N, what amount of work does he do?
Physics
1 answer:
Nonamiya [84]4 years ago
5 0
The equation for calculating the Work is very simple that is Work=Force x Displacement. We have a Force given as 209N and displacement = 10 meter.
Putting these values directly in the formula gives us Work = 209N x 10m
Work = 2090 Joule.

The weight of the bricks is not needed hear. 
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Determine the components, the magnitude and the angle (counter-clockwise with respect to the positive x axis) of the resultant v
LenKa [72]

Answer:

Explanation:

We shall represent vector B and C in terms of i and j .

B = 5 cos115 i + 5 sin115 j

= -2.11 i + 4.53j

Similarly

C = 4 cos255 i + 4 sin225 j

= -1.04 i -3.86 j

R = B + C

= -2.11 i + 4.53j  -1.04 i -3.86 j

= -3.15 i + .67 j

magnitude of R

= √( 3.15² + .67² )

= √( 9.92 +.45 )

= 3.22

Angle Ф

TanФ = - .67 / 3.15

= - .21

Ф = - 12⁰

= 180 - 12

= 168 degree counterclockwise from positive x axis.

3 0
3 years ago
The following problem presents hypothetical values. In the diagram below, the synodic period (one lunar month) is given as 30 da
balu736 [363]

Answer:

x is approximately 95.495

Explanation:

The given information are;

One lunar month = 30 days

The measured time between the first and third quarters = 14.9 days

Therefore, the angle of rotation for 30 days = 360°

The angle of rotation for 14.9 days = 14.9×360/30 = 178.8°

Therefore, whereby 2·θ = 178.8°

θ = 178.8°/2 = 89.4°

Therefore, given that the angle at the tangent from Sun to the Moon = 90°, we have;

The angle between the line from the Sun to the Moon = 90° - 89.4° = 0.6°

From sine rule, we have;

1/(sin 0.6) = x/(sin 90°)

x = (sin 90°)/(sin 0.6°) ≈ 95.495

x = 95.495.

6 0
3 years ago
In which of the following conditions would there be the most resistance?
Natasha2012 [34]

Answer:

A) A warm wire

Explanation:

A warm wire has the most resistance. Heating the metal wire causes atoms to vibrate more, which in turn makes it more difficult for the electrons to flow, increasing resistance. Heating the wire increases resistivity.

8 0
3 years ago
Why are chemical processes unable to produce the same amount of energy flowing out of the sun as nuclear fusion?
julsineya [31]

Answer:

Explanation:

One of the major differences between nuclear reactions and chemical reactions is that nuclear reactions involve larger amount of energy than chemical energy. <u>This is because the force between the protons and neutrons in the nucleus of an atom is much higher than the force of attraction between electrons and the positively charged nucleus, hence nuclear reactions involves/requires a larger amount of energy (because it's reactions involve the nucleus) than chemical reactions (because it's reactions involve the electrons)</u>.

Thus, during nuclear fusion, two light nuclei are bombarded against one another to produce a larger/heavier nuclei with the release of large amount of energy (because the forces between the protons and neutrons are much higher) unlike when two atoms/molecules are chemically combined together to form a new molecule with the rearrangement of electrons in the valence shells of the participating molecules.

3 0
4 years ago
If a small motor does 520 J of work to move a toy car 260 m, what force does the engine exert on the car?
ohaa [14]

Answer:

<h2>2 N</h2>

Explanation:

The force engine exert on the car can be found by using the formula

f =  \frac{w}{d}  \\

w is the workdone

d is the distance

From the question we have

f =  \frac{520}{260}  = 2 \\

We have the final answer as

<h3>2 N</h3>

Hope this helps you

4 0
3 years ago
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